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Fields

zyn_core::extract

Struct Fields

pub struct Fields<T: FromFields = Fields>(/* private fields */);

Expand description

Element extractor that pulls struct fields from the input.

Defaults to syn::Fields (accepts any field kind). Parameterize with syn::FieldsNamed or syn::FieldsUnnamed to restrict and validate. Access the inner value via Deref or the inner() method.

#[zyn::element]
fn my_element(#[zyn(input)] fields: zyn::Fields<syn::FieldsNamed>) -> proc_macro2::TokenStream {
    // fields.named — accessed via Deref to syn::FieldsNamed
}

Implementations§

impl<T: FromFields> Fields<T>

pub fn inner(self) -> T

Consumes the wrapper and returns the inner value.

Trait Implementations§

impl<T: FromFields> Deref for Fields<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T: FromFields> DerefMut for Fields<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T: FromFields> FromInput for Fields<T>

fn from_input(input: &Input) -> Result<Self>

Auto Trait Implementations§

impl<T> Freeze for Fields<T>
where T: Freeze,

impl<T> RefUnwindSafe for Fields<T>
where T: RefUnwindSafe,

impl<T> Send for Fields<T>
where T: Send,

impl<T> Sync for Fields<T>
where T: Sync,

impl<T> Unpin for Fields<T>
where T: Unpin,

impl<T> UnsafeUnpin for Fields<T>
where T: UnsafeUnpin,

impl<T> UnwindSafe for Fields<T>
where T: UnwindSafe,

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)

The target type on which the method may be called.

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.